According to the reports, this is biggest cyber threats that happened globally infecting 100 countries within 24 hours. All the biggest countries, Russia, China, etc have been infected by this Ransomware.
There were about 40 National Health Service (NHS) that have been hit with this threat, with operations and appointments cancelled. Most of them were affected in England and Scotland.
The malware spread quickly on Friday, with medical staff in the UK reportedly seeing computers go down "one by one". NHS staff shared screenshots of the WannaCry programme, which demanded a payment of $300 (£230) in virtual currency Bitcoin to unlock the files for each computer.
In Spain, a number of large firms - including telecoms giant Telefonica, power firm Iberdrola and utility provider Gas Natural - were also hit, with reports that staff at the firms were told to turn off their computers.
France's car-maker Renault, Portugal Telecom, the US delivery company FedEx and a local authority in Sweden were also affected.
China has not officially commented on any attacks it may have suffered, but comments on social media said a university computer lab had been compromised.